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Wooden doors bring warmth, character and a sense of solidity to a home. Whether it's a grand front door or a simple interior door, timber needs protection from moisture, sunlight, knocks and everyday wear. The finish you choose does more than keep the wood safe—it shapes the look of your home and determines how much maintenance you'll face. Paint, stain and varnish each behave differently, so it's worth taking a moment to match the finish to the job.
Timber is a living material. Even after it's been seasoned and crafted into a door, it responds to changes in humidity and temperature. Without a protective finish, wood can swell, crack, grey and rot. But not all protection is equal. A finish that's perfect for a busy family hallway might be a poor choice for a south-facing front door that takes the brunt of the weather.
Three factors should guide your decision: wear (how often the door is touched, kicked or exposed to the elements), light exposure (UV rays can fade colour and break down finishes), and style (does your home suit a painted cottage look or the natural grain of oak?). Get these right and your door will look good for years.
Paint is the most versatile finish. It's opaque, so it hides the grain and any imperfections, and it comes in every colour you can imagine. For period properties, a deep green or slate blue front door feels traditional. For modern homes, crisp white or charcoal works beautifully. Interior doors in paint can brighten a dark hallway or tie together mismatched timber.
Modern water-based paints are tough, quick-drying and low-odour, while oil-based paints often give a harder, glossier finish that suits front doors. The key to a long-lasting paint job is preparation: sand the door back, fill any dents, apply a suitable primer, then an undercoat and at least two topcoats. Paint can chip, especially on edges, but it's easy to touch up. Bear in mind that strong colours may fade in direct sunlight, so choose a UV-resistant exterior paint for south-facing doors.
If you want to see the wood, stain is your friend. It penetrates the timber to change its colour without hiding the grain. You can go lighter, darker, or simply warm up the natural tone. Stain is popular for interior doors, especially oak, pine and ash, where the grain is a feature. It's also a good option for front doors when you want a rich, traditional look.
However, stain alone offers little protection. It must be sealed with a topcoat—usually a clear varnish or oil—to guard against moisture and wear. Some stains include a built-in sealer, but check the label. Light exposure is a real concern: many stains fade over time, so look for products with UV inhibitors if the door faces the sun. Wear can show as scratches, and spot-repairing stain is trickier than touching up paint, so consider a durable topcoat.
Varnish and oil are clear finishes that let the natural beauty of the wood shine through. They differ in how they work. Varnish forms a protective film on the surface, while oil soaks into the timber to nourish and protect from within.
Varnish is hard-wearing and comes in gloss, satin or matt. It's a good choice for exterior doors, especially with added UV filters to prevent sunlight from breaking it down. But varnish can scratch and peel, and once it starts to fail, you often need to strip it back. Oil, such as linseed or tung oil, is easier to apply and repair. It gives a soft, natural sheen and can be spot-treated without sanding the whole door. The downside is that oil needs regular reapplication—often once or twice a year for exterior doors—and it doesn't offer the same level of protection against heavy knocks. Some oils can darken the wood over time, which may or may not suit your taste.
Think about where the door sits. A front door takes far more punishment than a bedroom door. For high-traffic exterior doors, paint or a tough exterior varnish is often best. If the door faces south and gets full sun, choose a finish with strong UV resistance and avoid very dark colours that absorb heat and fade.
For interior doors, wear is lighter, so you have more freedom. Stain and oil look wonderful on oak, while paint suits panelled doors in period homes. Consider your home's architecture: a Victorian terrace often looks best with painted doors, while a modern barn conversion might suit natural timber with a matt varnish. And don't forget maintenance. Paint needs repainting every five to seven years; oil needs annual attention; varnish may last longer but is harder to repair.
CJ Joinery shares practical, down-to-earth guidance on carpentry and joinery for homes for readers across the UK.
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